100GE以太网技术介绍
Advances in computer and networking technologies have likewise led to an increased demand for bandwidth within the data center. Multicore processing and virtualization have expanded the capacity and utility of individual servers.
Network attached storage (NAS) is rapidly replacing local disks, allowing access to larger
amounts of data, centralized maintenance, and improved disk usage. Reduced costs are realized by consolidating servers and by employing NAS, as well as through the reduction of the number of network interfaces required both on servers and on network switches. With this consolida-tion, however, comes higher network data volume on a per-server basis. Most data centers have switched from Gigabit to 10 Gbps technologies to meet their bandwidth needs.
A growing number of the largest Internet services – Google, Yahoo, MySpace, Facebook, AOL, for example – have a near-term expected need for 40 Gbps in the data center and100 Gbps between data centers, as illustrated in Figure 2 (courtesy of Google).
Figure 2. Data Center Network Aggregation
With the enterprise migration from frame relay and other private networks to IPSec and layer 2-3 VPNs, ISPs have found it necessary to offer 10 Gbps customer connections. ISPs traditionally require 4 to 10 times the bandwidth of their largest customer connection in order to provide the
proper levels of service.ISPs traditionally require 4 to 10 times the bandwidth of their largest customer connection in order to provide the proper levels of service.
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